Talk:Cathodic protection

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Contents 1 Diagram 2 Remove section? 3 Telluric Current Effect on CP System 4 Standards

[edit] Diagram

Can we get a quick, easy to read diagram? I'd make it in MS Paint, but I don't know how this process works (hence the request :))

Bmunden 15:21, 11 April 2007 (UTC)

[edit] Remove section?

Galvanising section appears unnecessary. A single sentence with link to Galvanization, mentioning that galvanising has some aspects of CP would be better. Agreement? Fdac 04:59, 26 September 2006 (UTC)

I absolutly disagree.58.174.194.182 12:05, 18 October 2007 (UTC)

Cathodic protection, doesnt make sence to me. any explanations?

Yes. It makes sense. It is the most common and standard method of corrosion protection. The application of two common types are as follows: Sacrificial Anodes (use the ignoble material to protect more noble material by sacrifying the ignoble one) are usually applied to protect "offshore structures" and "offshore pipelines". It is also applied for onshore pipelines and structures but less compare to offshore. Impressed Current Cathodic Protection (ICCP) is the method of corrosion prvention by injecting a current which is stronger than the "corrosion current" into the pipeline through soil (electrolyte) then, corrosion can not occur. Remember, corrosion takes place at the place where the current "goes out" from the pipeline into "soil (electrolyte)". So if the current can not "go out" and only "enters" the pipeline, there will be no corosion). It is widely used in protection of onshore pipelines, structures and tanks. Please take note that Cathodic Protection can protect ONLY the EXTERNAL corrosion. Not internal. [10:00 16 August, 2006 Thet Htin Oo]

[edit] Telluric Current Effect on CP System

The telluric current has substantial effect on CP system. The most obvious problem is substantial and rapid fluctuations in pipe-to-soil potential of onshore pipelines. Due to the mask of telluric, the true potential of pipeline can not be observed and the level of protection will be unknown. The phenomena of telluric effect is very unpredicatable. The amount of fluctuations or telluric effect depends on many parameters: - Size of pipeline (diameter) - Wall Thickness - Orientation (East-West oriented pipelines are more vulnerable) - Soil resistivity - Geographical area (different effect at equator and north pole) - Location (less effect when close to the sea) - Geometric configuration of pipeline (bends, etc) - Time of the day (different in day and night. Worse in the day) - Presence of other equipment (barred tees, insulating joints, etc.) - Lenght of pipeline (the longer the pipeline, the stronger the effect) etc. Up to now, there is no proven solution for this problem. And there are only a few books and publications about this topic in open literature.

This section should be discussed more widely. More comments and suggestions are welcome. 10:30 14 August, 2006 [Thet Htin Oo]

[edit] Standards

Added a section on standards to connect it to the real world. List is going to be long if all international and national standards are added so some of the standards that have been added might have to be removed , and only the key standards kept. but it's a start —Preceding unsigned comment added by 194.73.161.130 (talk) 15:06, 29 November 2007 (UTC)